Small Rifle Magnum primers in 223

Checking on my supply of primers. I found a 10 + year old box of CCI 450 Small magnum rifle primers.( 1,000 primers) I guess all I can do is try them. Any predictions on using these primers in my AR-15 223 ?

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Use 'em with ball powder, they'll be fine. I remember buying some Federal magnum small rifle primers during the last primer famine. I ended up using them in a .357 magnum! Times were tough back then. I used to have to walk ten miles to shoot, in a snowstorm, barefoot....

I know the Speer manual generally recommends magnum primers with ball powder. I tried a ball powder load with both CCI 400 and CCI 450 primers in my .223 Rem bolt gun. I didn't see any difference in grouping at 100 yards. They both shot about the same. This was before I got my chronograph, so I can't say anything regarding velocity.

I use a lot of 2200 powder in the 223s and the 450 primer HAS to be used. a 400 primer will open groups up to shotgun patterns...or worse!
If they still go bang they will work great with most ball powders.

__________________"Make everything as simple as possible, but not simpler." -Albert Einstein (1879-1955)